But, wouldn't the backup times of file datastore and mongoDB be different even if they were to be initiated at the same time ? I feel this might still cause some mismatch between the references in MongoDB and the blobs in the file data store if data is being written into both. Please advise.

The architecture of my AEM 6.4 author instance has the following 3 components:Nodestore: MongoDBDatastore: Filesystem on NAS drive mounted on the servercrx-quickstart: Situated in one of the mounts on the serverAs per adobe documentation (https://helpx.adobe.com/in/experience-manager/6-4/sites/admin...

In my design, I have the AEM author instance with its nodestore in MongoDB and its Datastore in NFS. The Publish instance has shares the NFS Datastore and has its own TarMK nodestore. There will be an offloading instance setup to offload some of the works of the Primary Author(like renditions genera...